Sewing



F. BAKER stumm Original Filed Jan. 17. 192s 4 sheets-snm. l

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l i 4 l l /N VENUR F50/fer* March 2 1926.

F. BAKER SEWING Original Filed Jan. 1v.. 192.1 4 sheets-sheet March I 2 1926,

- 1,575,186 F. BAKER SEWING Original Filed Jan, 17, 1923 4 Sheets-Sheet 3 Much 2,1926. 1,575,186

F. BAKER savane yoriginal Filed Jan. 17. 192s 4 sheets-sheet 4 Patented VMar. 2, 1926.

UNITED s'm'ri-:S`

PATENT OFFICE.

FREDERICK BAKER, 0F LONDON', ENGLAND, ASSIGNOR TO SINGLE THREAD LOCK- STITCE MACHINES LIMITED, OF LONDON, ENGLAND, A COMPANY 0F GREAT BRITAIN.

SEWING.

Original application filed January 17, 1923, Serial No. 613,223, Divided and this application filed January 25, 1924;.

To all wiz-0m t may concern Be it known that I, FREDERICK BAKER, a subject ofthe King of Great Britain, residing at 42 Lee Road, Blacklieath, London, England, have invented new and' useful Improvements in and Relating toy Sewing, of which the following is a speciiica-tion,

This inventionl relates to sewing the chief object being to provide novel forms ot' single threadseam which cannot be yunravelled and which are stronger than the ordinary double thread lock stitch seamy for the same size of thread. Certain methods ofmanipulating the thread to produce the novel forms of seam constitute the subject matter of a co-pending application which together with this application are divided from application Serial No. 613,223 filed 17 January 1923 which relates to mechanism for carrying4 out the methods and -producing the Seam.

According to the present 1nvention the seam is formed from a continuous thread and is characterized by the fact that each completed stitch involves in its formation a locked loop extending forwardly on the underside of the material and of a length approximately Vequal to `the distance between any two successive needle penetrating points. In one form of this seam the strands of each of the aforesaid loops are twisted upon one another'presenting a very neat appearance almost equivalent to a single thread.

Ey the term forwardly extending used in this specification is meant Aforwardly in the direction to be sewn or in other` words forwardly in the direction inv which the seam is advancing, Similarly the term rearwardly extending is used in the reverse sense.

In order that thel completed seams constituting the subject matterk of this invention may be clearly understood I will first briefly indicate certain methods of formation, although the invention constituting this application is not to be rega-rdedasflimited to any particular method of realization, but direct-ed to the product generally.Y

In the accompanying drawings :T4

Figures 1 to 6 illustrate diagrammatcal- 1r six .stages 'in e seein. method et manip Serial No. 688,570.

ulating the thread to produce a seam in accordance with the present invention,

Figure 7 is a plan view on Ylhe uni'lerside of the material and Figure 8 is a' perspective view of the novel seam produced by the method illustrated in Figures l to 6 these Figures 7 and 8 'being exaggerated and disproportioned for convenience; of illustration and showing the thread loose throughout.

' Figure 9y shows the, same seam as it would appefr more closelyV drawn up against'thc material.

Figurer4 9 shows the same seam as it would method of manipulating the thread and- Figures 1.2, V13 andl` illustrate in a manner similar to Figures 7, 8 and 9 the resultant Seam.

Figures l5 and 16 illustratey a further modified method of manipulating the thread and Figures 17, 18y and 19. illustrate in a manner similar toFigures 7, 8 and 9 the resultant seam.

Referring first more porticularly to the manipulation o the thread, it is seen by reference to Figures l to 6 that as a needle threadV loop A consisting of the strands al and a2 is being drawn out bellow thel needle plate as shown in Figure l the strands al is formed with a twist or incipient loop B as shown in F igure 2, and the loop A continues to be drawn out it is twisted so that the position of the back and front `strands is reversed as Shown in Figure 3 and meanwhile the loop B is drawn back through they bight of a loop C. At this stage the usual feed mechanism ot the machine operates and thc material and thread shift tothe left as shown in Figure 4. As the loop A is drawnup it is passed. (i. e., noosed) over. the loop B as shown in Figure 5y and the tightening of the thread by the usual take-up mechanism causes the actual hightorcbend ofthe loop A to slip around the strands of theloop B as shown in Figure 6. Durin c tina-l tightening of the thread the"V encircled sti-andls of the loop B andthe 'stra-ifflsofthe loop C are twisted 01 tned' @verl 1112011. themselves thereby PIO- duciii'g a strong and firmly locked stitch and a close `appearance of the; double strands lying lciigitiieinllt"intertwined @lese I locked loop.

ncath the material between the penetrations somewhat as shown' in Figure 0 The twisting ot the strands of the loops takes place during the tightening ot' each knel, thus accounting for the fact that the strands ot' the loop to the right in Figure 8 are not shown twisted.

Studying` more closely the seam as shown in Figures 7 and 8 it is seen that it comprises a 4line ot' lengths ot single thread on the top side ot the material 'sewn and a line ot twisted locked loops on the underside. lt is also seen that each loop is interlinlzed at its bight with a succeeding loop and locked at the bight ot a preceding loop.

It is important to observe with .reference to each locked loop that the strand which locks the loop is the strand that during formation passed direct to the needle and that in the finished seam is represented by the top length" olf thread lying immediately above the underloop which it has locked.

In Figures 10 and 1l a modiied manipulation ot' the thread is represented according to which the needle penetrates the bight ot the preceding loop and one strand of the needle loop A is dra-wn as a loop B above the bight of the preceding. loop C while the needle loop-itself is being drawn out twisted and drawn back in the usual manner. The product in this case is shown magnified distorted and untightened in Figuresl and 1B and the tightened product is shown in Figure 14.

In Figures and 1G a further modilied manipulation of the thread is represented according to wliiclrone strand of the needle loop A is drawn as a loop B below .the bight of the preceding loop C instead of above it as in Figures 10 and 1l. rlhe product in this case is represented enlarged distorted and untightened in Figures 17, 1S and partly tightened in Figure 19.

What I claim is l. Single thread lock stitching comprising a line of lengths of single thread on the top side ot the material sewn and a line of loops oit the same thread on the underside, each loop being'locked at its root by its own upwardly passing strand leading to the top length of single thread lying above said 2. Single thread lock stitching comprising a line of lengths of single thread on the top side ot the material sewn and a line ol loopso the same thread on the underside,

each loop being locked at its root by its own upwardly passing strand leading to the top length et single thread lying above said locked loop, and having its longitudinally extending strands longitudinally twisted upon one another.

3. Single thread lock stitching comprising a line of lengths of single thread on the top side 0f .the materia-1 sewn and a line et loops on the underside each inter-linked at its bight with a succeeding loop and locked at'the bight of a preceding loop by the top length of single thread lying immediatel above said locked loop.

il. Single thread loclr stitching comprising a line ot lengths of single thread on the top side of the material sewn and a line ot loops on the underside each interlinked at its bight with a succeeding loop and locked to the bight ot a preceding loop by the top length otl single thread lying immediately above said locked loop.

5. Single thread lock stitching comprising a line of lengths of single thread on the top side of the material sewn and a line or loops ot intertwisted strands on the underside each interlinlred at its bight with a succeeding twisted loop and locked to the bight of a preceding twisted loop by the top length of single thread lying immediately above said locked loop.

6. Single thread lock stitching comprising a line of lengths of single thread on the top side of the material sewn and a line of loops of intertwisted strands on the underside each interlinked at its bight with a succeeding twisted loop and locked at the bight of a preceding twisted loop by the top length ot single thread lying immediately above said locked loop.

7. Single thread lock stitching comprising a line of lengths ot single thread on the top side of the material sewn, and a line of loops on the underside, each length of thread on the top after passing at its forward end from the previously completed stitch to the underside of the material sewn extending further forward as one strand of the next underloop and then rearward as the other strand of this loop and inally encircling both strands before passing through the material again to the top side.

8. Single thread lock stitching comprising a line ot lengths of single thread on the top side of the material sewn, and a line ot interlinl-ed loops on the underside, each length of thread on the top ai'ter passing at its forward end to the underside of the material sewn extending'through the bight oit the previously formed underloop, further forward as one strand ot the next underloop. and then rearward as the other strand ofi this loop .and through the aforesaid bight., and finally encircling both strands ol' the said next underloop betere passing through the material again to the top side.

D. Single thread lock stitching comprising a line of lengths of single thread on the top side of the material sewn and a line ot loops of intertwisted strands on the underside, each length of thread ou the top after passing at its forward end to the underside of the material sewn extending further forward as one strand et the neat twisted underloop and then rearward as the other strand of this loop and finally encircling both strands of the said next underloop before passing through the material again to the top side.

l0. Single thread lock stitching comprising a line of lengths of single thread on the top side of the material sewn, and a line of interlinked loops of intertwisted strands on the underside, each length of thread on the top after passing at its forward end to the underside of the material sewn extending through the bight of the previously formed twisted and inter-linked underloop, further forward as one strand of the next twisted and inter-linked under-loop and then rearward as the other strand of this loop and through the aforesaid bight and finally encircling both strands of the said next undei-, loop before passing through the material again to the top side. n

1l. Single thread lock stitching in which each completed stitch involves in its formation a loop extending from the previously completed stitch forwardly on the underside of the material and of length approximately equal to the distance between any two successive needle penetrations and looked at its root by the upwardly passing strand leading to the top length of single thread lying immediately above said locked loop.

FREDERICK BAKER. 

